Support stand



FIG. 1 is a perspective view of a support stand illustrating my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a side elevational view thereof, the opposite side view being substantially identical; and,

FIG. 6 is a bottom plan view thereof.

The broken showing of a cylinder in FIGS. 1, 3 and 4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a support stand, as shown and described. 